Titanic tourist sub goes missing sparking search

[iain/hsm]

You can hear shrimp doing the nasty in 25,000 feet of water.

You would hear a wrench against the hull.

It's one thing alive and well whacking steel plate on the end of an 18" Crescent wrench
Quite another I suspect with a ten dollar plastic gameboy console on your knees in your socks

As for the shrimps if the sub has indeed imploded it would be a distraction from doing the nasty for a while
I guess.

 

[Dan]

OceanGate, company behind missing Titanic tourist sub, once subject of lawsuit over safety complaints

OceanGate once faced a lawsuit from a former employee who alleged they were fired for raising safety concerns about the vessel that went missing while descending to the Titanic.

www.foxbusiness.com

"The documents say Lochridge learned the viewport manufacturer "would only certify to a depth of 1,300 meters due to the experimental design of the viewport supplied by OceanGate, which was out of the Pressure Vessels for Human Occupancy standards.

"OceanGate refused to pay for the manufacturer to build a viewport that would meet the required depth of 4,000 meters," the complaint states."

Nowhere in the article did it say that they corrected the issue or used a new viewport

This would explain the sudden loss of communication when the sub almost reaching to the bottom, implosion.

 

[Bigbella]

Miracles can happen. I pray we have one up north. If they can find 4 kids in the jungle.... just maybe.

Let's see, just for Vegas odds -- a bunch of indigenous kids, lost in the Amazon, with at least a working knowledge of what is edible versus inedible, at a single atmosphere, without air limitations; or, that of a handful of wealthy dilettantes, bolted into a substandard, largely untested carbon fiber and titanium cigar tube in 13,000 FSW at 400 atmospheres in the frigid North Atlantic off Newfoundland, controlled by a Playstation device, probably hyperventilating, eyeballing gauges and the clock, while failing middle school arithmetic of air-time left under the pressure; and looking for any still unused ziplock bags?

Sadly, the Titan probably imploded when the support ship first lost communications . . .

 

[-JD-]

Hmmmm.
From physics it will be remembered that when gas is the transmitting medium, the denser the gas, the slower the speed of sound, and yet the speed of sound in water is about four times greater than that in air. Although this seems contradictory, it is not, because there is another more important factor that influences the speed of sound. In truth, the speed of sound is determined primarily by the elasticity of the medium and only secondarily by the density.

From PRINCIPLES OF UNDERWATER SOUND Chapter 8

No argument with the speed of sound under water.

I was talking about power being distributed on an expanding spherical boundary which is proportional to the square of the radius. I had not even factored in absorption losses. Since this is a "deep" environment I would argue it is spherical vs cylindrical, but assuming the better case ...

from section 8.7.4 the loss (cylindrical vs spherical propagation, but ignoring possible bottom reflection) is:

Total Loss (in decibels) = R + 10*Log(R) [eq. 8-24, simplified]

for 3000m that means a loss on the order of over 3,000 dB That would make discrimination vs ambient noise extraordinarily difficult.




How deep do the sonobuoy hydrophones go? If they get down over 3km, then there is much less loss and much greater isolation from surface noise.



ETA: I guess transitive property of Rule 34 or something, we are talking about audio Shrimp Porn ....

 

[iain/hsm]

Make an air tank out of the composites the sub is made out of, pump it up to 10k psi

Perfectly achievable reliable and maintainable. I was the design engineer for something similar on the Skandi Santos. Basically a 700 BarG gas compressor package. A big scuba compressor filling packs of 12 large cylinder tubes in cradles at the surface to 700 bar in order to pressure up well heads for testing to 200 bar at depth.

SKANDI SANTOS - Akofs Offshore

www.akofsoffshore.com

Add an offshore capable vessel rated for a 170 metric tonne lift in 2500 MSW depth metres sea water
with a second for back up and a 3000MSW rated RoV for support.

Truth is the gameboy would be cheaper and we are a tad short on rope

 

[Wookie]

How deep do the sonobuoy hydrophones go?

As deep as you set them. Problem is attaching them to a set of transmitters.

 

[grf88]

While on a dive trip to Tobermory one year I was staying at the late Art Amos' Trails End Lodge and met Joseph McInnis who had visited the Titanic in the Russian MIR submersible. He told me how when it was time to ascend they did not have enough power in the batteries to release whatever had to be released. They had to shut down all lighting and heating and wait in the dark until the batteries regenerated somewhat which I believe has something to do with gas dissipation on the battery plates. He said it was a rather tense time which I thought was some understatement.

 

[-JD-]

As deep as you set them. Problem is attaching them to a set of transmitters.

If you didn't have to connect them, the answer would be "the bottom" , but I was going after how long a connection does it have ....

I'm going to take that as a OpSec "I could tell you, but then I'd have to ..." answer.

 

[berndo]

Make an air tank out of the composites the sub is made out of, pump it up to 10k psi?

Pump it up with gas from where? That gas has to be somewhere. At 4000 m a storage tank would have to be at 400 bar and be the same volume as the 'air bag'. I don't think that would work unless you bring huge amounts of gas... and there is no space of that inside the sub... and I didn't see any huge storage tanks on the ouside of the sub either.

 

[O-ring]

Perfectly achievable reliable and maintainable. I was the design engineer for something similar on the Skandi Santos. Basically a 700 BarG gas compressor package. A big scuba compressor filling packs of 12 large cylinder tubes in cradles at the surface to 700 bar in order to pressure up well heads for testing to 200 bar at depth.

SKANDI SANTOS - Akofs Offshore

www.akofsoffshore.com

Add an offshore capable vessel rated for a 170 metric tonne lift in 2500 MSW depth metres sea water
with a second for back up and a 3000MSW rated RoV for support.

Truth is the gameboy would be cheaper

I'm not a materials engineer, but any worry about cyclic fatigue with a carbon fiber pressure hull of that size? At least with metals/alloys you can often detect signs of fatigue (cracks, etc.), but not sure carbon fiber would give you any indication short of catastrophic failure/shattering. I wonder if they performed any kind of non-destructive testing (if such tests exist?) on the hull between dives or annually.

Also...does the bonding of dissimilar materials (the CF hull and the titanium end caps) jump out at you as being particularly treacherous? It just seems like the two materials might deform to different degrees in a high pressure environment and if not done exactly right might be a point of failure.